content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Thrown when attempting to build a protocol message that is missing required
   * fields.  This is a {@code RuntimeException} because it normally represents
   * a programming error:  it happens when some code which constructs a message
   * fails to set all the fields.  {@code parseFrom()} methods <b>do not</b>
   * throw this; they throw an {@link InvalidProtocolBufferException} if
   * required fields are missing, because it is not a programming error to
   * receive an incomplete message.  In other words,
   * {@code UninitializedMessageException} should never be thrown by correct
   * code, but {@code InvalidProtocolBufferException} might be.
   *
   * @author kenton@google.com Kenton Varda
   */
  public class UninitializedMessageException extends RuntimeException {
    private static final long serialVersionUID = -7466929953374883507L;
  
    public UninitializedMessageException(final MessageLite message) {
      super("Message was missing required fields.  (Lite runtime could not " +
            "determine which fields were missing).");
      missingFields = null;
    }
  
    public UninitializedMessageException(final List<String> missingFields) {
      super(buildDescription(missingFields));
      this.missingFields = missingFields;
    }
  
    private final List<String> missingFields;
  
    /**
     * Get a list of human-readable names of required fields missing from this
     * message.  Each name is a full path to a field, e.g. "foo.bar[5].baz".
     * Returns null if the lite runtime was used, since it lacks the ability to
     * find missing fields.
     */
    public List<String> getMissingFields() {
      return Collections.unmodifiableList(missingFields);
    }
  
    /**
     * Converts this exception to an {@link InvalidProtocolBufferException}.
     * When a parsed message is missing required fields, this should be thrown
     * instead of {@code UninitializedMessageException}.
     */
    public InvalidProtocolBufferException asInvalidProtocolBufferException() {
      return new InvalidProtocolBufferException(getMessage());
    }
  
    /** Construct the description string for this exception. */
    private static String buildDescription(final List<String> missingFields) {
      final StringBuilder description =
        new StringBuilder("Message missing required fields: ");
      boolean first = true;
      for (final String field : missingFields) {
        if (first) {
          first = false;
        } else {
          description.append(", ");
        }
        description.append(field);
      }
      return description.toString();
    }
  }
  